Abstract: A wind instrument neck receiver tension mechanism is provided having a body, a retaining ridge, and a tension band. The body has a lower body end and a upper body end. The upper body end defines a thin collar seating wall, which has at least one notch. In some embodiments there are four equally sized notches. A retaining ridge extends from the thin collar seating wall and a tension band having an adjustable compression ring, the adjustable compression ring disposed between said thin collar seating wall and the retaining ridge. When adjusted to a first position, the compression ring compresses the thin collar seating wall in a uniform compression around a circumference of a neck receiver of a wind instrument.

Abstract: Disclosed is a bass clarinet that enables even splitting of the harmonics without compromising the efficacy of the instrument, without increasing manufacturing costs, and without the requirement of a clarinettist relearning how to play the instrument. It is further an object of the disclosure to describe bass clarinets with the ability to change harmonics without requiring the player to compensate with embouchure and air pressure.